/*
 * Copyright (c) 2002-2003 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.module.random;


/* ====================================================================
 * The OpenSymphony Software License, Version 1.1
 *
 * (this license is derived and fully compatible with the Apache Software
 * License - see http://www.apache.org/LICENSE.txt)
 *
 * Copyright (c) 2001 The OpenSymphony Group. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        OpenSymphony Group (http://www.opensymphony.com/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "OpenSymphony" and "The OpenSymphony Group"
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact license@opensymphony.com .
 *
 * 5. Products derived from this software may not be called "OpenSymphony"
 *    or "OSCore", nor may "OpenSymphony" or "OSCore" appear in their
 *    name, without prior written permission of the OpenSymphony Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 */
import com.opensymphony.module.random.Rijndael_Algorithm;

import java.security.InvalidKeyException;


/**
 * DOCUMENT ME!
 *
 * @author $author$
 * @version $Revision: 125 $
 */
public class Rijndael {
    //~ Instance fields ////////////////////////////////////////////////////////

    private Object sessionKey;
    private int blocksize;
    private int keysize;

    //~ Constructors ///////////////////////////////////////////////////////////

    public Rijndael(int keysize, int blocksize) {
        if (!((keysize == 128) || (keysize == 192) || (keysize == 256))) {
            throw new RuntimeException("Invalid keysize");
        }

        if (!((blocksize == 128) || (blocksize == 192) || (blocksize == 256))) {
            throw new RuntimeException("Invalid blocksize");
        }

        this.keysize = keysize;
        this.blocksize = blocksize;
    }

    public Rijndael() {
        this(128, 128);
    }

    //~ Methods ////////////////////////////////////////////////////////////////

    public int getBlockSize() {
        return blocksize;
    }

    public int getKeySize() {
        return keysize;
    }

    public byte[] decipher(byte[] block) {
        return Rijndael_Algorithm.blockDecrypt(block, 0, sessionKey);
    }

    public byte[] encipher(byte[] block) {
        return Rijndael_Algorithm.blockEncrypt(block, 0, sessionKey);
    }

    public void initialize(byte[] key) {
        byte[] nkey = new byte[keysize >> 3];
        System.arraycopy(key, 0, nkey, 0, nkey.length);

        try {
            sessionKey = Rijndael_Algorithm.makeKey(nkey);
        } catch (InvalidKeyException e) {
            //can't happen?
            e.printStackTrace();
        }
    }
}
